Weapons and Tools
Weapons and tools significantly enhance a user's abilities...
...for better or worse.
Outfits and Armor
Outfits and Armor offer protection from threats and the thorns of nature. However, developed cultures may find a use beyond protection: self-expression.
Collectibles
Whether or not a trinket has a defined “purpose” may be unimportant or otherwise irrelevant. Truthfully, we often ascribe purpose and connections to material things on a personal and emotional level, and it needn't go beyond that.